#include <avr/pgmspace.h> //将字符串资源放进Flash存储器以节省SRAM空间，详见https://www.arduino.cc/reference/en/language/variables/utilities/progmem/

const char strNetErr[] PROGMEM = "网络连接失败，请检查以太网并重启"; 
const char strAddr[] PROGMEM = "NTP服务器IP地址为";
const char strNtpStatA[] PROGMEM = "已响应"; const char strNtpStatB[] PROGMEM = "次NTP请求";
const char *const strNetwork[] PROGMEM = {strNetErr, strAddr, strNtpStatA, strNtpStatB};